When you copy tests from one project to another in QAC, all related items are copied as well, copying history, notes and attachments from the original items. We re use test cases frequently and are often asked to copy previously executed test cases over to new projects. It is inconvenient to go through the new tests and delete all history, notes and attachments. I believe the alternative is to upload fresh tests every time. Since we deal with thousands of tests the ability to copy tests from one project to another creating a brand new instance of that test is important.
Suggestion: A Fast Edit option to copy the test, or multiple tests only, without pulling over any history, notes or attachments from the copy source.